Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1986-05-05
1988-04-12
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360 77, 369 14, 369275, 369284, G11B 582, G11B 1300
Patent
active
047378778
ABSTRACT:
A magnetic recording disk is formed on a rigid aluminum substrate coated with a polymeric dielectric layer. A thin film metallic position-indicating track is applied to the upper surface of the dielectric layer. The dielectric material is coated with a magnetic recording medium. A thin film of aluminum forms the patterned capacitive and optically reflective track. The dielectric layer is composed of a very similar material to the matrix material in the magnetic recording medium.
The disk can be flexible or floppy and it is not necessary to have the extra dielectric layer in such a case, where the substrate is a dielectric.
REFERENCES:
patent: 3460118 (1969-08-01), Woolfolk
patent: 4237506 (1980-12-01), Manly
patent: 4351010 (1982-09-01), Arai
patent: 4397751 (1983-08-01), Dickstein et al.
patent: 4417290 (1983-11-01), Tanaka et al.
patent: 4684547 (1987-08-01), Di Stefano et al.
Bothun, "Three-Film Laminate Substrate for Magnetic Disk," IBM TDB, Feb. 1976, vol. 18, No. 9, p. 3027.
Koshino et al., "Optical Method of the Head Positioning in Magnetic Disk Systems", IEEE Trans. of Mag., Sep. 1980, MAG 16, pp. 631-633.
Acosta et al., "Floppy Disc Embossing for Servo Applications," IBM TDB, vol. 21, No. 10, pp. 4259-4260, Mar. 1979.
Gruss et al., "Servo System for Magnetic Recording Based on Time Comparison," Jul. 1980, vol. 23, No. 2, pp. 787-789.
Cannon, "Optical or Capacitive Digital Servos for Record Members," IBM TDM, Feb. 1977, vol. 19, No. 9, pp. 3303-3304.
Potter, R. I., "Capacitive Servoing on Topgraphic Variations", IBM TDB, vol. 21, No. 6, Nov. 1978, p. 2506.
Comstock et al., "Servo Disk with Overlapping Servo and Data Tracks", Nov. 1973, IBM TDB, vol. 16, No. 6, p. 1818.
Tsu, "Preparation of Adherent Thin Magnetic Films by Chemical Reduction," Oct. 1959, vol. 2, No. 3, p. 36.
Krongelb Sol
Romankiw Lubomyr T.
Scranton Robert A.
Thompson David A.
Goodwin John J.
International Business Machines - Corporation
Severin David J.
Tognino Alexander
Wolff John H.
LandOfFree
Structure to provide optical and capacitive contrast on magnetic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Structure to provide optical and capacitive contrast on magnetic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure to provide optical and capacitive contrast on magnetic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1433098